Drilled Shaft Instrumentation and Lateral Load Testing ... · Drilled Shaft Instrumentation and...
Transcript of Drilled Shaft Instrumentation and Lateral Load Testing ... · Drilled Shaft Instrumentation and...
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Drilled Shaft Instrumentation and
Lateral Load Testing
Ironton-Russell Bridge over the Ohio
River
ODOT OGE Workshop
Jamal Nusairat, Ph.D., P.E.
May 7, 2013
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Presentation Outline
• ODOT Research on Rock Socketed
Drilled Shafts
• Lateral Load Test Special Provision
• Instrumentation and Testing
• Lateral Load Test Results
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Ohio Bedrock – Map of Testing
Calcareous
Shales
Non-
Calcareous
Shales
Limestone
and Dolomite
Shales and
Sandstone
Red
Shales
= Test Completed
= Proposed
LEGEND
= Pressuremeter
The bedrock map is from the ODNR website
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A New Correlation for Em based on GSI Classification ODOT SJN 134137: Design of Rock Socketed Drilled Shafts
A new correlation based on GSI rock classification system was proposed using data from Nicholson and Bieniawski (1990) and Ironton-Russell test data
Em=Ei exp(GSI/21.7) / 100
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Proposed Em Correlation Based on GSI Classification
0.0
20.0
40.0
60.0
80.0
100.0
0 20 40 60 80 100
GSI
Em
/Ei (
%)
Bieniawski (1978)
Serafin and Pereira (1983)
Ironton-Russell
Regression
Em/Ei=exp(GSI/21.7)/100
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Lateral Load Test Submittal
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Test Planning and Preparation
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Test Planning and Preparation
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Test Planning and Preparation
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Subsurface Profile Subsurface Profile
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Rock Coring
Boring B-7 rock core run 1 and 2.
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Subsurface Profile Pressuremeter Testing
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Subsurface Profile Pressuremeter Testing
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Subsurface Profile Pressuremeter Testing
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Subsurface Profile Pressuremeter Testing
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c
p
v
1vv12
b
m0
RRE
Interpreting Dilatometer Test Data
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Dilatometer Test Results
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Unconfined Compressive Strength Test Results
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Testing Summary
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Comparison of Dilatometer Modulus Vs. Unconfined Compression Modulus
Average dilatometer modulus, Emass = 569 ksi
Average unconfined compressive strength modulus, Ecore = 1,670 ksi
Modulus reduction ratio, Emass/Ecore = 0.34
For RQDavg = 84%, the modulus reduction ratio compares favorably with Bieniawski (1984)
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Test Shaft 1 Proof Cores
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Type of
Instrument
Sister
Bar
(each)
Load
Cell
(each)
Inclinomet
er Tube
(ft.)
Tiltmete
r
Survey
Prisms
Dial
Gages
Test Shaft #
1
26 ft. Deep
Socket
22 1 75 1 4 1
Test Shaft #
2
18 ft. Deep
Socket
22 65 1 4 1
Total
Quantity 44 1 140 2 8 2
Instrumentation used for lateral load test
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Test Shafts Instrumentation
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Test Planning and Preparation
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Test Planning and Preparation
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Test Planning and Preparation
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Test Planning and Preparation
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Test Planning and Preparation
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Test Results - Deflection
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Test Results - Deflection
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T.S. # 1 T.S. # 2
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Test Results - Deflection
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Test Results - Deflection
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Test Results – Tilt Angle
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Layer
No.
Top
Elev.
(ft.)
Bottom
Elev.
(ft.)
Unit
Wt.
(pcf)
Elasticity
Modulus
(psi)
Uniaxial
Compressive
Strength
(psi)
RQD
(%)
Notes
1 473 469 140 10000 6400 97 Weathered
Sandstone
2 469 457 140 120000 9000 100 Unweathered
Sandstone
3 457 450 135 5000 250 75 Coal/claystone
4 450 ? 140 120000 9000 100 Unweathered Sandstone
Selected Parameters to Match the Deflection from Lateral Load Test
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LPILE Results